The answer to 'why is my silverfish trails' is that silverfish are leaving behind trails of excrement, shed skin, and other debris as they move around your home. Silverfish are small, wingless insects that thrive in damp, dark areas and feed on carbohydrates, proteins, and cellulose. Their trails are a sign of an infestation and can indicate where they are traveling and hiding in your home.
Silverfish trails are often found in bathrooms, kitchens, basements, and other areas with high humidity. The trails are made up of tiny, irregular lines or spots that can be difficult to see at first. As the infestation grows, the trails become more noticeable and may lead you to their hiding spots, such as behind baseboards, in cracks and crevices, or inside cabinets and drawers.